var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const cors = require('cors'); //解决跨域
const expressJWT = require('express-jwt')

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
const { PRIVATE_KEY } = require('./utils/constant');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(cors());
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

//登录验证token
app.use(expressJWT({
  secret: PRIVATE_KEY,
  algorithms: ['HS256'], 
 }).unless({
  path: ['/api/users/regist','/api/users/login'] //⽩名单,除了这⾥写的地址，其他的URL都需要验证
 }));

app.use('/', indexRouter);
app.use('/api/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  if(err.name ==='UnauthorizedError'){
    res.status(401).send('token过期');
  }else{
      // set locals, only providing error in development
      res.locals.message = err.message;
      res.locals.error = req.app.get('env') === 'development' ? err : {};
    
      // render the error page
      res.status(err.status || 500);
      res.render('error');
  }
});

module.exports = app;
